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 Documentation Ver 1.0.0 August 2011 by
 <a href="http://mmc.geofisica.unam.mx/luiggi">Luis M. de la Cruz</a> <br>
 <a href="http://mmc.geofisica.unam.mx"> GMMC </a> -
 <a href="http://www.geofisica.unam.mx/recnat/"> Depto. de Recursos Naturales </a> -
 <a href="http://www.geofisica.unam.mx"> Instituto de Geof&iacute;sica </a> -
 <a href="http://www.unam.mx"> UNAM </a><br>
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<div class="title">Examples/06ConvDiff/convdiff1.cpp</div>  </div>
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<a href="convdiff1_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 
<a name="l00042"></a>00042 <span class="comment">// Note: Schemes: Quick_..., CDS_..., Upwind_...</span>
<a name="l00043"></a>00043 <span class="preprocessor">#include &lt;iostream&gt;</span>
<a name="l00044"></a>00044 <span class="preprocessor">#include &lt;cmath&gt;</span>
<a name="l00045"></a>00045 
<a name="l00046"></a>00046 <span class="preprocessor">#include &quot;Meshes/Uniform.hpp&quot;</span>
<a name="l00047"></a>00047 <span class="preprocessor">#include &quot;Equations/ScalarEquation.hpp&quot;</span>
<a name="l00048"></a>00048 <span class="preprocessor">#include &quot;Schemes/Quick_Hay.hpp&quot;</span>
<a name="l00049"></a>00049 <span class="preprocessor">#include &quot;Equations/Momentum_XCoDi.hpp&quot;</span>
<a name="l00050"></a>00050 <span class="preprocessor">#include &quot;Schemes/Quick_XHay.hpp&quot;</span>
<a name="l00051"></a>00051 <span class="preprocessor">#include &quot;Equations/Momentum_YCoDi.hpp&quot;</span>
<a name="l00052"></a>00052 <span class="preprocessor">#include &quot;Schemes/Quick_YHay.hpp&quot;</span>
<a name="l00053"></a>00053 <span class="preprocessor">#include &quot;Equations/PressureCorrection.hpp&quot;</span>
<a name="l00054"></a>00054 <span class="preprocessor">#include &quot;Schemes/Simplec.hpp&quot;</span>
<a name="l00055"></a>00055 <span class="preprocessor">#include &quot;Solvers/TDMA.hpp&quot;</span>
<a name="l00056"></a>00056 <span class="preprocessor">#include &quot;Utils/inout.hpp&quot;</span> 
<a name="l00057"></a>00057 <span class="preprocessor">#include &quot;Utils/num_utils.hpp&quot;</span>
<a name="l00058"></a>00058 <span class="preprocessor">#include &quot;Utils/GNUplot.hpp&quot;</span>
<a name="l00059"></a>00059 <span class="keyword">using namespace </span>Tuna;
<a name="l00060"></a>00060 
<a name="l00061"></a>00061 <span class="comment">// Scalar field in two dimensions</span>
<a name="l00062"></a>00062 <span class="keyword">typedef</span> <a class="code" href="structTuna_1_1TunaArray.html#af3bcab5018eec3d7697c9fb03ad89157" title="Definition of big arrays to store scalar fields on meshes.">TunaArray&lt;double,2&gt;::huge</a> ScalarField2D;
<a name="l00063"></a>00063 
<a name="l00064"></a>00064 <span class="keyword">template</span>&lt;<span class="keyword">class</span> T_e, <span class="keyword">class</span> T_x, <span class="keyword">class</span> T_y, <span class="keyword">class</span> T_p&gt;
<a name="l00065"></a>00065 <span class="keywordtype">double</span> SIMPLEC(T_e &amp;, T_x &amp;, T_y &amp;, T_p &amp;, <span class="keywordtype">int</span>, <span class="keywordtype">double</span>, <span class="keywordtype">double</span>, <span class="keywordtype">double</span>);
<a name="l00066"></a>00066 
<a name="l00067"></a>00067 <span class="keywordtype">double</span> errorT, errorX, errorY;
<a name="l00068"></a>00068 
<a name="l00069"></a>00069 <span class="keywordtype">int</span> main() 
<a name="l00070"></a>00070 {
<a name="l00071"></a>00071 
<a name="l00072"></a>00072 <span class="preprocessor">#ifdef WITH_GNUPLOT</span>
<a name="l00073"></a>00073 <span class="preprocessor"></span>    GNUplot plotter;
<a name="l00074"></a>00074     <span class="keywordtype">int</span> stop;
<a name="l00075"></a>00075     plotter(<span class="stringliteral">&quot;set grid&quot;</span>);
<a name="l00076"></a>00076     plotter(<span class="stringliteral">&quot;set contour&quot;</span>);
<a name="l00077"></a>00077     plotter(<span class="stringliteral">&quot;set cntrparam level discrete 0.4, 0.3, 0.2, 0.1, 0, -0.1, -0.2, -0.3, -0.4&quot;</span>);
<a name="l00078"></a>00078     plotter(<span class="stringliteral">&quot;set view 0,0&quot;</span>);
<a name="l00079"></a>00079     plotter(<span class="stringliteral">&quot;set size 0.73,1&quot;</span>);
<a name="l00080"></a>00080     plotter(<span class="stringliteral">&quot;unset surface&quot;</span>);
<a name="l00081"></a>00081 <span class="preprocessor">#endif</span>
<a name="l00082"></a>00082 <span class="preprocessor"></span>
<a name="l00083"></a>00083     <span class="keywordtype">double</span> length_x, length_y;
<a name="l00084"></a>00084     <span class="keywordtype">int</span> num_nodes_x, num_nodes_y;
<a name="l00085"></a>00085     <span class="keywordtype">double</span> leftwall, rightwall;
<a name="l00086"></a>00086     <span class="keywordtype">double</span> tolerance, dt;    
<a name="l00087"></a>00087     <span class="keywordtype">int</span> max_iter, max_time_steps, frequency;
<a name="l00088"></a>00088     <span class="keywordtype">double</span> Prandtl, Rayleigh;
<a name="l00089"></a>00089 
<a name="l00090"></a>00090 <span class="comment">// Reading data from the input file</span>
<a name="l00091"></a>00091     std::ifstream input_cin (<span class="stringliteral">&quot;input1&quot;</span>);
<a name="l00092"></a>00092     input_cin &gt;&gt; length_x
<a name="l00093"></a>00093               &gt;&gt; length_y
<a name="l00094"></a>00094               &gt;&gt; num_nodes_x 
<a name="l00095"></a>00095               &gt;&gt; num_nodes_y 
<a name="l00096"></a>00096               &gt;&gt; leftwall
<a name="l00097"></a>00097               &gt;&gt; rightwall 
<a name="l00098"></a>00098               &gt;&gt; dt
<a name="l00099"></a>00099               &gt;&gt; max_time_steps
<a name="l00100"></a>00100               &gt;&gt; tolerance
<a name="l00101"></a>00101               &gt;&gt; max_iter
<a name="l00102"></a>00102               &gt;&gt; Prandtl
<a name="l00103"></a>00103               &gt;&gt; Rayleigh
<a name="l00104"></a>00104               &gt;&gt; frequency;
<a name="l00105"></a>00105     input_cin.close();
<a name="l00106"></a>00106 <span class="comment">//</span>
<a name="l00107"></a>00107 <span class="comment">//  Mesh definition</span>
<a name="l00108"></a>00108 <span class="comment">//</span>
<a name="l00109"></a>00109     <a class="code" href="classTuna_1_1StructuredMesh.html" title="General structured meshes on rectangular domains.">StructuredMesh&lt;Uniform&lt; double, 2&gt;</a> &gt; mesh(length_x, num_nodes_x,
<a name="l00110"></a>00110                                               length_y, num_nodes_y);
<a name="l00111"></a>00111     mesh.print();
<a name="l00112"></a>00112     <span class="keywordtype">double</span> dx = mesh.getDelta(X);
<a name="l00113"></a>00113     <span class="keywordtype">double</span> dy = mesh.getDelta(Y);
<a name="l00114"></a>00114     <span class="keywordtype">int</span> num_vols_x = mesh.getExtentVolumes(X);
<a name="l00115"></a>00115     <span class="keywordtype">int</span> num_vols_y = mesh.getExtentVolumes(Y);
<a name="l00116"></a>00116 
<a name="l00117"></a>00117     ScalarField2D T(mesh.getExtentVolumes());      <span class="comment">// Temperature</span>
<a name="l00118"></a>00118     ScalarField2D p(mesh.getExtentVolumes());      <span class="comment">// pressure</span>
<a name="l00119"></a>00119     ScalarField2D pp(mesh.getExtentVolumes());     <span class="comment">// pressure correction</span>
<a name="l00120"></a>00120     ScalarField2D u(mesh.getExtentVolumes());      <span class="comment">// u-velocity</span>
<a name="l00121"></a>00121     ScalarField2D v(mesh.getExtentVolumes());      <span class="comment">// v-velocity</span>
<a name="l00122"></a>00122     ScalarField2D us(num_nodes_x, num_vols_y); <span class="comment">// u-velocity staggered</span>
<a name="l00123"></a>00123     ScalarField2D vs(num_vols_x, num_nodes_y); <span class="comment">// v-velocity staggered</span>
<a name="l00124"></a>00124 
<a name="l00125"></a>00125     ScalarField2D Tn(mesh.getExtentNodes());
<a name="l00126"></a>00126     ScalarField2D pn(mesh.getExtentNodes());
<a name="l00127"></a>00127     ScalarField2D un(mesh.getExtentNodes());
<a name="l00128"></a>00128     ScalarField2D vn(mesh.getExtentNodes());    
<a name="l00129"></a>00129 
<a name="l00130"></a>00130     Range all = Range::all();
<a name="l00131"></a>00131     T(T.lbound(firstDim), all) = leftwall;   <span class="comment">// Left</span>
<a name="l00132"></a>00132     T(T.ubound(firstDim), all) = rightwall;    <span class="comment">// Rigth</span>
<a name="l00133"></a>00133 
<a name="l00134"></a>00134     SparseMatrix&lt; Diagonal&lt;double, 2&gt; &gt; A(num_nodes_x, num_nodes_y); 
<a name="l00135"></a>00135  
<a name="l00136"></a>00136     ScalarField2D             b(num_nodes_x, num_nodes_y);
<a name="l00137"></a>00137 
<a name="l00138"></a>00138 <span class="comment">//</span>
<a name="l00139"></a>00139 <span class="comment">// Energy equation definition</span>
<a name="l00140"></a>00140 <span class="comment">//</span>
<a name="l00141"></a>00141     <a class="code" href="classTuna_1_1ScalarEquation.html" title="This class derives from GeneralEquation through B &amp; N trick.">ScalarEquation&lt;Quick_Hay&lt;double,2&gt;</a> &gt; energy(T, A, b, mesh.getDeltas());
<a name="l00142"></a>00142     energy.setDeltaTime(dt);
<a name="l00143"></a>00143     energy.setNeumann(TOP_WALL);
<a name="l00144"></a>00144     energy.setNeumann(BOTTOM_WALL);
<a name="l00145"></a>00145     energy.setDirichlet(LEFT_WALL);
<a name="l00146"></a>00146     energy.setDirichlet(RIGHT_WALL);
<a name="l00147"></a>00147     energy.setUvelocity(us);
<a name="l00148"></a>00148     energy.setVvelocity(vs);
<a name="l00149"></a>00149     energy.print();
<a name="l00150"></a>00150 
<a name="l00151"></a>00151 <span class="comment">//</span>
<a name="l00152"></a>00152 <span class="comment">// Xmomentum equation definition</span>
<a name="l00153"></a>00153 <span class="comment">//</span>
<a name="l00154"></a>00154     <a class="code" href="classTuna_1_1Momentum__XCoDi.html" title="This class derives from GeneralEquation through B &amp; N trick.">Momentum_XCoDi&lt;Quick_XHay&lt;double, 2&gt;</a> &gt; mom_x(us, A, b, mesh.getDeltas());
<a name="l00155"></a>00155     mom_x.setGamma(Prandtl);
<a name="l00156"></a>00156     mom_x.setDeltaTime(dt);
<a name="l00157"></a>00157     mom_x.setDirichlet(LEFT_WALL);
<a name="l00158"></a>00158     mom_x.setDirichlet(RIGHT_WALL);
<a name="l00159"></a>00159     mom_x.setDirichlet(TOP_WALL);
<a name="l00160"></a>00160     mom_x.setDirichlet(BOTTOM_WALL);
<a name="l00161"></a>00161     mom_x.setUvelocity(us);
<a name="l00162"></a>00162     mom_x.setVvelocity(vs);
<a name="l00163"></a>00163     mom_x.setPressure(p);
<a name="l00164"></a>00164     mom_x.print();
<a name="l00165"></a>00165 
<a name="l00166"></a>00166 <span class="comment">//</span>
<a name="l00167"></a>00167 <span class="comment">// Ymomentum equation definition</span>
<a name="l00168"></a>00168 <span class="comment">//    </span>
<a name="l00169"></a>00169     <a class="code" href="classTuna_1_1Momentum__YCoDi.html" title="This class derives from GeneralEquation through B &amp; N trick.">Momentum_YCoDi&lt;Quick_YHay&lt;double, 2&gt;</a> &gt; mom_y(vs, A, b, mesh.getDeltas());
<a name="l00170"></a>00170     mom_y.setGamma(Prandtl);
<a name="l00171"></a>00171     mom_y.setDeltaTime(dt);
<a name="l00172"></a>00172     mom_y.setDirichlet(LEFT_WALL);
<a name="l00173"></a>00173     mom_y.setDirichlet(RIGHT_WALL);
<a name="l00174"></a>00174     mom_y.setDirichlet(TOP_WALL);
<a name="l00175"></a>00175     mom_y.setDirichlet(BOTTOM_WALL);
<a name="l00176"></a>00176     mom_y.setUvelocity(us);
<a name="l00177"></a>00177     mom_y.setVvelocity(vs);
<a name="l00178"></a>00178     mom_y.setPressure(p);
<a name="l00179"></a>00179     mom_y.setTemperature(T);
<a name="l00180"></a>00180     mom_y.setRayleigh(Rayleigh);
<a name="l00181"></a>00181     mom_y.print();
<a name="l00182"></a>00182 <span class="comment">//</span>
<a name="l00183"></a>00183 <span class="comment">// Pressure correction equation definition</span>
<a name="l00184"></a>00184 <span class="comment">// </span>
<a name="l00185"></a>00185     <a class="code" href="classTuna_1_1PressureCorrection.html" title="This class derives from GeneralEquation through B &amp; N trick.">PressureCorrection&lt;Simplec&lt;double, 2&gt;</a> &gt; press(pp, A, b, mesh.getDeltas());
<a name="l00186"></a>00186     press.applyBounds(1, num_nodes_x-1, 1, num_nodes_y-1);
<a name="l00187"></a>00187     press.setUvelocity(us);
<a name="l00188"></a>00188     press.setVvelocity(vs);
<a name="l00189"></a>00189     press.set_du(mom_x.get_du());
<a name="l00190"></a>00190     press.set_dv(mom_y.get_dv());
<a name="l00191"></a>00191     press.setPressure(p);
<a name="l00192"></a>00192     press.print();
<a name="l00193"></a>00193 
<a name="l00194"></a>00194     ofstream sorsumfile(<span class="stringliteral">&quot;./Data1/sorsum&quot;</span>), nusseltfile(<span class="stringliteral">&quot;./Data1/nusselt&quot;</span>),
<a name="l00195"></a>00195       errorTfile(<span class="stringliteral">&quot;./Data1/errorT&quot;</span>), errorXfile(<span class="stringliteral">&quot;./Data1/errorX&quot;</span>), 
<a name="l00196"></a>00196       errorYfile(<span class="stringliteral">&quot;./Data1/errorY&quot;</span>);
<a name="l00197"></a>00197     
<a name="l00198"></a>00198     <span class="keywordtype">double</span> sorsum, resorm, nusselt;
<a name="l00199"></a>00199     
<a name="l00200"></a>00200     <span class="keywordtype">int</span> iteration = 0;
<a name="l00201"></a>00201 
<a name="l00202"></a>00202     NumUtils::interpolateToNodes(Tn, T);
<a name="l00203"></a>00203     NumUtils::interpolateToNodes(pn, p);
<a name="l00204"></a>00204     NumUtils::interpolateToNodesUs(un, us);
<a name="l00205"></a>00205     NumUtils::interpolateToNodesVs(vn, vs);
<a name="l00206"></a>00206   
<a name="l00207"></a>00207     <span class="keywordflow">for</span>(iteration = 1; iteration &lt;= max_time_steps; ++iteration) {
<a name="l00208"></a>00208       sorsum = SIMPLEC(energy, mom_x, mom_y, press,
<a name="l00209"></a>00209                        max_iter, tolerance, dx, dy);
<a name="l00210"></a>00210 
<a name="l00211"></a>00211       <span class="keywordflow">if</span> ( (iteration % frequency) == 0 ) {
<a name="l00212"></a>00212         NumUtils::interpolateToNodes(Tn, T);
<a name="l00213"></a>00213         NumUtils::interpolateToNodes(pn, p);
<a name="l00214"></a>00214         NumUtils::interpolateToNodesUs(un, us);
<a name="l00215"></a>00215         NumUtils::interpolateToNodesVs(vn, vs);     
<a name="l00216"></a>00216 
<a name="l00217"></a>00217 <span class="preprocessor">#ifdef WITH_DX</span>
<a name="l00218"></a>00218 <span class="preprocessor"></span>        InOut::writeToFile_DX(Tn, iteration, <span class="stringliteral">&quot;./Data1/temp.&quot;</span>, dx, dy); 
<a name="l00219"></a>00219         InOut::writeToFile_DX(pn, iteration, <span class="stringliteral">&quot;./Data1/pres.&quot;</span>, dx, dy); 
<a name="l00220"></a>00220         InOut::writeToFile_DX(un, vn, iteration, <span class="stringliteral">&quot;./Data1/velc.&quot;</span>, dx, dy);
<a name="l00221"></a>00221 
<a name="l00222"></a>00222 <span class="preprocessor">#endif</span>
<a name="l00223"></a>00223 <span class="preprocessor"></span>
<a name="l00224"></a>00224 <span class="preprocessor">#ifdef WITH_GNUPLOT</span>
<a name="l00225"></a>00225 <span class="preprocessor"></span>        InOut::writeToFile(Tn, 1, <span class="stringliteral">&quot;./Data1/temp.&quot;</span>, dx, dy); 
<a name="l00226"></a>00226         InOut::writeToFile(pn, 1, <span class="stringliteral">&quot;./Data1/pres.&quot;</span>, dx, dy); 
<a name="l00227"></a>00227         InOut::writeToFile(un, 1, <span class="stringliteral">&quot;./Data1/uvel.&quot;</span>, dx, dy);
<a name="l00228"></a>00228         InOut::writeToFile(vn, 1, <span class="stringliteral">&quot;./Data1/vvel.&quot;</span>, dx, dy);
<a name="l00229"></a>00229         std::cout &lt;&lt; <span class="stringliteral">&quot;\n &gt;---&gt; Press &lt;1&gt; and then &lt;enter&gt; to continue \n&quot;</span>;
<a name="l00230"></a>00230         std::cin &gt;&gt; stop;       
<a name="l00231"></a>00231         plotter(<span class="stringliteral">&quot;splot \&quot;Data1/temp.00001\&quot; w l&quot;</span>);
<a name="l00232"></a>00232         <span class="comment">//          plotter(&quot;splot \&quot;Data1/pres.00001\&quot; w l&quot;);</span>
<a name="l00233"></a>00233         <span class="comment">//          plotter(&quot;splot \&quot;Data1/uvel.00001\&quot; w l&quot;);</span>
<a name="l00234"></a>00234         <span class="comment">//          plotter(&quot;splot \&quot;Data1/vvel.00001\&quot; w l&quot;);</span>
<a name="l00235"></a>00235 <span class="preprocessor">#endif</span>
<a name="l00236"></a>00236 <span class="preprocessor"></span>      }
<a name="l00237"></a>00237         
<a name="l00238"></a>00238       sorsumfile &lt;&lt; iteration &lt;&lt; <span class="stringliteral">&quot;\t&quot;</span> &lt;&lt; sorsum &lt;&lt; endl;     
<a name="l00239"></a>00239       nusselt = NumUtils::calcNusseltVert(T,  dx * 0.5, dy, 0);
<a name="l00240"></a>00240       nusseltfile &lt;&lt; iteration &lt;&lt; <span class="stringliteral">&quot;\t&quot;</span> &lt;&lt; nusselt &lt;&lt; endl;
<a name="l00241"></a>00241       errorTfile &lt;&lt; iteration &lt;&lt; <span class="stringliteral">&quot;\t&quot;</span> &lt;&lt; errorT &lt;&lt; endl;
<a name="l00242"></a>00242       errorXfile &lt;&lt; iteration &lt;&lt; <span class="stringliteral">&quot;\t&quot;</span> &lt;&lt; errorX &lt;&lt; endl;
<a name="l00243"></a>00243       errorYfile &lt;&lt; iteration &lt;&lt; <span class="stringliteral">&quot;\t&quot;</span> &lt;&lt; errorY &lt;&lt; endl;
<a name="l00244"></a>00244       cout &lt;&lt; <span class="stringliteral">&quot;=&gt; Iter = &quot;</span> &lt;&lt; iteration 
<a name="l00245"></a>00245            &lt;&lt; <span class="stringliteral">&quot; s = &quot;</span> &lt;&lt; sorsum
<a name="l00246"></a>00246            &lt;&lt; <span class="stringliteral">&quot; e_T = &quot;</span> &lt;&lt; errorT
<a name="l00247"></a>00247            &lt;&lt; <span class="stringliteral">&quot; e_X = &quot;</span> &lt;&lt; errorX
<a name="l00248"></a>00248            &lt;&lt; <span class="stringliteral">&quot; e_Y = &quot;</span> &lt;&lt; errorY
<a name="l00249"></a>00249            &lt;&lt; <span class="stringliteral">&quot; Nu = &quot;</span> &lt;&lt; nusselt &lt;&lt; endl;
<a name="l00250"></a>00250     }
<a name="l00251"></a>00251 
<a name="l00252"></a>00252 <span class="preprocessor">#ifdef WITH_DX</span>
<a name="l00253"></a>00253 <span class="preprocessor"></span>    std::cout &lt;&lt; <span class="stringliteral">&quot;\n\n NOTE: The data were written in the [./Data1] directory in DX format&quot;</span>;
<a name="l00254"></a>00254 <span class="preprocessor">#endif</span>
<a name="l00255"></a>00255 <span class="preprocessor"></span>
<a name="l00256"></a>00256     <span class="keywordflow">return</span> 0;
<a name="l00257"></a>00257 }
<a name="l00258"></a>00258 
<a name="l00259"></a>00259 
<a name="l00260"></a>00260 <span class="keyword">template</span>&lt;<span class="keyword">class</span> T_e, <span class="keyword">class</span> T_x, <span class="keyword">class</span> T_y, <span class="keyword">class</span> T_p&gt;
<a name="l00261"></a>00261 <span class="keywordtype">double</span> SIMPLEC(T_e &amp;energy, T_x &amp;mom_x, T_y &amp;mom_y, T_p &amp;pressure, 
<a name="l00262"></a>00262                <span class="keywordtype">int</span> max_iter, <span class="keywordtype">double</span> tolerance, <span class="keywordtype">double</span> dx, <span class="keywordtype">double</span> dy) 
<a name="l00263"></a>00263 {
<a name="l00264"></a>00264     <span class="keywordtype">double</span> sorsum = 10.0, tol_simplec = 1e-2;
<a name="l00265"></a>00265     <span class="keywordtype">int</span> counter = 0;
<a name="l00266"></a>00266 
<a name="l00267"></a>00267     <span class="keywordflow">while</span> ( (sorsum &gt; tol_simplec) &amp;&amp; (counter &lt; 20) ) {
<a name="l00268"></a>00268         energy.calcCoefficients();
<a name="l00269"></a>00269         Solver::TDMA2DY(energy, tolerance, max_iter);
<a name="l00270"></a>00270         errorT = energy.calcErrorL1();
<a name="l00271"></a>00271         energy.update();
<a name="l00272"></a>00272 
<a name="l00273"></a>00273         mom_x.calcCoefficients();       
<a name="l00274"></a>00274         Solver::TDMA2DY(mom_x, tolerance, max_iter);
<a name="l00275"></a>00275         errorX = mom_x.calcErrorL1();
<a name="l00276"></a>00276         mom_x.update();
<a name="l00277"></a>00277 
<a name="l00278"></a>00278         mom_y.calcCoefficients();
<a name="l00279"></a>00279         Solver::TDMA2DY(mom_y, tolerance, max_iter);
<a name="l00280"></a>00280         errorY = mom_y.calcErrorL1();
<a name="l00281"></a>00281         mom_y.update();
<a name="l00282"></a>00282 
<a name="l00283"></a>00283         pressure.calcCoefficients();
<a name="l00284"></a>00284         Solver::TDMA2DY(pressure, tolerance, max_iter);
<a name="l00285"></a>00285         pressure.correction();
<a name="l00286"></a>00286         sorsum = fabs( pressure.calcSorsum() );
<a name="l00287"></a>00287 
<a name="l00288"></a>00288         ++counter;
<a name="l00289"></a>00289     }
<a name="l00290"></a>00290 
<a name="l00291"></a>00291     <span class="keywordflow">return</span> sorsum;
<a name="l00292"></a>00292     
<a name="l00293"></a>00293 }
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